"This is all too sudden for me, and it hasn't hit me yet," Park added. "I think this is an honour for my whole family."

Park reaches No 1 exactly a year after she held a news conference in South Korea to announce she would take up membership on the LPGA Tour, after a season in which she won seven times on the Korean LPGA Tour, contended in three major championships and had risen to world No 10.

Her incredible form carried through to the LPGA Tour this year with two wins to date including a first major at the US Women's Open, nine top-10 finishes and top-20 finishes at three other majors.

Not only that, the super-consistent Park has never missed a cut in her 29 career LPGA Tour starts.

She had romped away with the LPGA's Rookie of the Year honours long before this season ended and with two tournaments to go, she is ranked second in the Player of the Year standings.

Only Ryu, who is sitting out this week, is ahead of Park who is seeking to become just the second player in history after Nancy Lopez in 1978 to earn both rookie and player of the season honours in the same year.

Park had originally declared she wanted to become No 1 within three years of moving full-time to the LPGA Tour.

"I've accomplished my goal a lot faster than I'd planned, and it does put some pressure on my shoulders," Park said.

"But I am also determined to keep trying harder and harder. I think I was able to get this far this fast because I continued to push myself without settling for less."